Venezuelan President Hugo Chavez hinted that the U.S. may be behind a “very strange” bout of cancer affecting several leaders aligned with him in South America.

Chavez, speaking a day after Argentine President Cristina Fernandez de Kirchner was diagnosed with thyroid cancer, said the Central Intelligence Agency was behind chemical experiments in Guatemala in the 1940s and that it’s possible that in years to come a plot will be uncovered that shows the U.S. spread cancer as a political weapon against its critics.

“It’s very difficult to explain, even with the law of probabilities, what has been happening to some of us in Latin America,” Chavez said in a nationally televised speech to the military. “Would it be so strange that they’ve invented technology to spread cancer and we won’t know about it for 50 years?”
Chavez, who was diagnosed with an undisclosed form of cancer in June and had a baseball-sized tumor removed in Cuba, has called for a regional summit of leaders who have battled cancer including Brazilian President Dilma Rousseff, her predecessor Luiz Inacio Lula Da Silva and Paraguay’s Fernando Lugo.

“I’m just sharing my thoughts, but it’s very, very, very strange,” Chavez said. “Evo take care of yourself, Correa, be careful, we just don’t know,” he said, referring to Evo Morales and Rafael Correa, the leaders of Bolivia and Ecuador.

Thomas Mittnacht, press director at the U.S. embassy in Caracas, declined to comment when reached by telephone.